As the workmen progressed into the mountain side there were many difficulties to overcome. Day and night without ceasing the work went on. Laborers would faint from the combined heat and bad air, and be carried to the outer world to be revived. Carpenters followed the drillers, trackmen coming closely after. Loose rock, freshly blasted, was tumbled into waiting cars and hauled away over rails laid perhaps but half an hour before. Constantly in the front was Sutro himself, coat flung aside, sleeves rolled up. In the midst of the flying dirt, great heat, bad air, dripping slush, and slippery mud he worked side by side with the grimy, half-naked miners, thus showing himself capable not only of planning a great work, but of seeing personally that it was well done, no matter with what sacrifice to his own ease and comfort. After the tunnel was completed, Mr. Sutro sold his interest in it for several millions of dollars. How that money was expended, any visitor to San Francisco well knows. With it were built the great Sutro baths, with their immense tanks of pure and constantly changing, tempered ocean water, their many dressing rooms, their grand staircases, adorned with rare growing plants, their tiers of seats rising in rows, one above another, with room for thousands of spectators, and their galleries of pictures and choice works of art. Over all is a roof of steel and tinted glass. Nowhere else in America is there so fine a bathing establishment. Besides this there are the lovely gardens of Sutro Heights, developed by Mr. Sutro’s money and genius from the barren sand-hills of the San Miguel rancho. In addition to these is the choice library of about two hundred thousand volumes, which is of great use to the people of San Francisco. Perhaps neither San Francisco nor California has yet quite appreciated the value of the work of Adolph Sutro. Since 1848 the state of California has sent to the United States Mint over one billion dollars in gold. Of this, little Nevada County, which seems to be worth literally her weight in gold, has sent over two hundred and forty million. The Empire Mine is the leading producer of California, but there are others nearly as rich. Nevada City is in the center of this mining country. The streets are very hilly, and after a heavy rain people may be seen searching the city gutters and newly-formed rivulets for gold, and they are sometimes rewarded by finding fair-sized nuggets washed down from the hills above. A visitor to one of the deep mines of California says:-- “We descended to the seven hundred foot level, where the day before a pile of ore had been blasted down. A little piece of the quartz, crushed in a mortar panned out four dollars in gold. I picked out one piece of rock, not larger than a peach, and the manager, after weighing and testing it, announced that it contained ten dollars in free gold. The kick of a boot would reveal ore which showed glittering specks of pure gold.”